WARNING PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY DIAGNOSTICS

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1 TECH SHEET - DO OT DISCAD PAGE 1 AIG Electric Shock Hazard Disconnect power before servicing. eplace all parts and panels before operating. Failure to do so can result in death or electrical shock. PECAUTIOS TO BE OBSEVED BEFOE AD DUIG SEVICIG TO AVOID POSSIBLE EXPOSUE TO EXCESSIVE MICOAVE EE a. Do not operate or allow the oven to be operated with the door open. b. Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: 1. Interlock Operation 2. Proper Door Closing 3. Seal and Sealing Surfaces (Arcing, ear & Other Damage) 4. Damage to or Loosening of Hinges & Latches 5. Evidence of Dropping or Abuse c. Before turning on microwave power for any service test or inspection within the microwave generating compartments, check the magnetron, waveguide or transmission line and cavity for proper alignment, integrity and connections. d. Any failed or misadjusted components in the interlock, monitor, door seal, and microwave generation, and transmission systems shall be repaired, replaced, or adjusted by procedures described in service manual before the oven isreleased to the owner. e. A microwave leakage check to verify compliance with the Federal performance standard should be performed on each oven prior to release to the owner. f. Do not attempt to operate the oven if the door glass is broken. Electrostatic Discharge (ESD) Sensitive Electronics ESD problems are present everywhere. ESD may damage or weaken the electronic control assembly. The new control assembly may appear to work well after repair is finished, but failure may occur at a later date due to ESD stress. Use an anti-static wrist strap. Connect wrist strap to green ground connection point or unpainted metal in the appliance - O - touch your finger repeatedly to a green ground connection point or unpainted metal in the appliance. Before removing the part from its package, touch the anti-static bag to a green ground connection point or unpainted metal in the appliance. Avoid touching electronic parts or terminal contacts; handle electronic control assembly by edges only. hen repackaging failedelectronic control assembly in anti-static bag, observe above instructions. DIAGOSTICS Disconnect power and perform the following checks: The most common cause for control failure is corrosion on connectors. Therefore, disconnecting and reconnecting wires will be necessary throughout test procedures. Check all connections before replacing components, looking for broken or loose wires, failed terminals, or wires not pressed into connectors far enough. All tests/checks should be made with a VOM or DVM having a sensitivity of 20,000 ohms per volt DC or greater. esistance checks must be made with power cord unplugged from outlet, and with wiring harness or connectors disconnected. Fahrenheit ( F) to Celsius ( C) Conversion The default is Fahrenheit ( F). 1. Press the BOIL pad for 5 seconds. The temperature will be displayed in degrees Celsius indicated by the C in the temperature display. 2. To return the display to degrees Fahrenheit press the BOIL pad again for 5 seconds. F will show in the temperature display. FO SEVICE TECHICIA'S USE OLY PAT O EV. A

2 PAGE 2 TECH SHEET - DO OT DISCAD POBLEM: Bake Temperature eeds Adjustment 1. Press BAKE pad for 5 seconds. The default temp. 0 or a previously entered offset temp. will show in the Temp. Display. Press the TEMP pad up arrow ( ) to increase the temperature in 10 F or 5 C increments. Press the TEMP pad down arrow ( ) to decrease the temperature in 10 F or 5 C increments. Maximum offset temperature adjustment is ±30 F or ±15 C. 2. Press the STAT pad to save the temp. adjustment. Microwave Oven Power Output Test The power output of the magnetron can be measured by the following test: (for accurate results, the line voltage must be 120 VAC and the oven cavity must be clean). 1. Fill a glass measuring cup with 16 oz. (453cc) of tap water. Stir the thermometer through the water until the temperature stabilizes. 2. Place the cup of water in the center of the oven. Operate on HIGH for 60 seconds. 3. Stir the thermometer through the water and record the maximum temperature. 4. Subtract the cold water temperature from the hot water temperature. The normal result should be a F ( C) rise in temperature. OTE: Less than a 20 F (11.1 C) temperature rise may indicate an operating voltage of less than 110 volts or a low power output from the magnetron. Cooking time can be adjusted to compensate for either circumstance. eplace the magnetron only if the water temperature rise indicates a power output well beyond the normal result. Programming the Cavity Size hen replacing the electronic control, be sure to program the cavity size: 1. ithin 60 seconds of power up, press the following touchpads: OVE CACEL, AM HOLD, BAKE, TEMP DO, TIME OFF, MIUTE DO, MICO CACEL, 5, OVE STAT/ETE, OVE LIGHT. 2. Size is shown in display - id Press CLOCK pad until correct size is displayed. 4. Press CACEL. 5. Press and hold OVE CACEL pad for 5 seconds to verify programming. OVE SHUTDO THEMAL FUSE The oven shutdown thermal fuse is located at the back of the oven. It will shut down the elements if the temperature at the back of the oven exceeds component limits. Verify that the oven shutdown thermal fuse is OK. To replace this thermal fuse, refer to chart at right for correct part number. Thermal Fuse Part o. Opening Temp. F F ± 10 F eclose Temp. F Marking (with Black Letters) Pink/ht Stripe F+18 F to 248 F 0 F Yellow/ht Stripe F ± 11.7 F ed 31 F F ± 11.7 F Orange/ht Stripe MAX F ± 11.7 F Blue F ± 11.7 F Green/ht Stripe F+18 F to 230 F 0 F Blue/ht Stripe PAT O EV. A FO SEVICE TECHICIA'S USE OLY

3 TECH SHEET - DO OT DISCAD PAGE 3 FAILUE/EO DISPLAY CODES OTES: Always disconnect power before touching internal parts of the oven! Upon replacement, immediately return old electronic oven control using the mailing label supplied with each new control. FAULT CODE F0 F1 F2 F3 F5 EO CODE All E Codes E0 E1 MEAIG OF FAILUE CODE Default F code - no failure Electronic control malfunction Key held down too long or key is shorted Keypad keytail not connected E5, E6 CACEL key drive line open E0 E1 E2 E3 E0 E1 ECOMMEDED EPAI POCEDUE ill only be displayed if user presses and holds CACEL key for 5 seconds and there is no pre-existing fault. Press CACEL to clear display. 2. eplace control. 2. Check keypad connector for firm connection. 3. Press CACEL. If error code returns after 60 sec., replace keypad. 4. eplace control. Temperature sensor opened =2875 ohm (by spec) Temperature sensor shorted =825 ohm (by spec) Oven temp too high - over 575 F (302 C) in COOK mode Oven temp too high - over 950 F (510 C) in CLEA mode Door is open, but latch is locked (condition exists when door switch is open indicating an open door, and latch switch is closed indicating a locked door) Self-clean latch will not lock/unlock 2. Check sensor connection. 3. Measure sensor resistance (1080 Ω at 70 F[21 C]. Add 2 Ω per degree F.) 4. If resistance is not valid replace sensor. 5. If sensor resistance and connections are good, then check for welded-closed relays on the control. 2. Check the latch assembly: latch arm pivot joint, arm/motor connection, plunger and hook springs. 3. Check the Latch Motor: -Check for firm electrical connections. - Disconnect the two wires from the motor and measure the resistance of the motor. If the motor is open ( Ω) orshorted (0Ω), it should be replaced. 4. Check the Latch Switch. Disconnect it and use a continuity tester: Door latched = switch closed, continuity should read 0Ω. Door unlatched = switch open, continuity should read Ω. 5. Check Door Open/Closed Switch. Disconnect it and use a continuity tester: Door open = switch open, continuity should read Ω. Door closed = switch closed, continuity should read 0Ω. 6. Check Sister Board: - Check connections latch motor sister board. -eplace sister board. 7. Check power and element connections. 8. eplace control. FO SEVICE TECHICIA'S USE OLY PAT O EV. A

4 PAGE 4 TECH SHEET - DO OT DISCAD IE HAESS SCHEMATIC OTES: hen replacing the electronic control, be sure to program the cavity size. See Programming the Cavity Size on page 2. Dots indicate connections or splices. Circuit shown in standby/off mode with microwave oven door and lower oven door closed. L1 HALOGE MICOAVE CAVITY LIGHT LIGHT POE SUPPLY J1-5 ELECTOIC FILTE - P # L2 L1 B 20A J1-1 15A CAVITY T.O.D. PIMAY ITELOCK SITCH DOO SITCH TO MOITO P27-1 P26-1 P27-4 P29 P28 ELECTOIC COTOL MICOAVE DOO SESE CICUIT P26-2 P27-2 MAGETO T.O.D. MAGETO FA TUTABLE B MAGETO 900 OUTPUT P16-3 P16-2 ITELOCK SITCH 2 J1-4 MICOAVE LOE OVE ETU LIE MUST BE COECTED COTOL POE SFOME O DOO SITCH (O LATCH ASSEMBLY) B OVE DOO LOCK MOTO LATCH SISTE BOAD Y P2-1 M P1-4 ~ B LATCH SITCH (OPEATED BY MOTO) P16-7 P16-5 P24-3 P23-1 P23-2 P23-3 P25-1 P24-1 P24-6 P24-5 P24-4 V ICADESCET 15/LB UPPE BLOE MOITO SITCH FOM PIMAY ITELOCK SITCH LOE BLOE P2-2 P1-3 P25-2 DOUBLE LIE BEAK ELAY V P23-4 TEMP SESO 1080Ω at 70 F ( 21 C ) 1654Ω at 350 F ( 177 C) V P23-6 P18-3 P18-2 P18-4 P18-1 O BAKE-2000 BOIL-3000 O OVE SHUTDO THEMAL FUSE P16-1 G PAT O EV. A FO SEVICE TECHICIA'S USE OLY

5 TECH SHEET - DO OT DISCAD PAGE 5 OVE STIP CICUITS The following individual circuits are for use in diagnosis. Do not continue with the diagnosis of the appliance if a fuse is blown, a circuit breaker is tripped, or if there is less than a 240 volt power supply at the wall outlet. BAKE AD PEHEAT-BAKE BOIL CLEA AD PEHEAT-CLEA ETU LIE MUST BE COECTED DOO SITCH (O LATCH ASSEMBLY) P23-1 O B B P23-2 L1 OVE DOO LOCK MOTO LATCH SISTE BOAD Y P2-1 M P1-4 ~ LATCH SITCH (OPEATED BY MOTO) P23-3 P25-1 DOUBLE LIE BEAK ELAY L2 P2-2 P1-3 P25-2 P18-4 P18-1 P24-5 O BAKE-2000 BOIL-3000 O OVE SHUTDO THEMAL FUSE LOE BLOE FO SEVICE TECHICIA'S USE OLY PAT O EV. A

6 PAGE 6 TECH SHEET - DO OT DISCAD MICOAVE STIP CICUIT The following individual circuits are for use in diagnosis. Do not continue with the diagnosis of the appliance if a fuse is blown, a circuit breaker is tripped, or if there is less than a 240 volt power supply at the wall outlet. MICOAVE FULL POE / VAIABLE POE L1 P27-1 B J1-5 LIGHT POE SUPPLY HALOGE MICOAVE CAVITY LIGHT P27-4 P27-2 MAGETO FA TUTABLE B MOITO SITCH J1-4 20A FUSE J1-1 15A FUSE CAVITY T.O.D. DOO SHO I CLOSED POSITIO PIMAY ITELOCK SITCH P26-1 P29 P28 MICOAVE DOO SESE CICUIT P26-2 MAGETO T.O.D. HIGH VOLTAGE SYSTEM 900 OUTPUT SECODAY ITELOCK SITCH P24-3 P24-6 V UPPE BLOE ELAY LOGIC MICOAVE OVE ELAY LOGIC LOE OVE ELAY LOGIC KEY OTE: IF LOE OVE IS I CLEA MODE, MICOAVE ILL OT FUCTIO. PAT O EV. A FO SEVICE TECHICIA'S USE OLY

7 TECH SHEET - DO OT DISCAD PAGE 7 COMPOET FOT/TOP /EA SEVICEABLE CA BE TESTED AT COTOL PAEL* CHECK POITS ESULTS Electronic Control Front Control Transformer Front Electronic Filter ear Membrane Switch Front Incandescent Lights Light Bulb - Front Light Assy. - ear Latch Motor Front Latch Switch Front P23-3 () to P23-1 () Door Switch Front P23-2 (B) to P23-1 () Sister Board Front P25-1 () to P1-4 () and P25-2 () to P1-3 () Control Power Transformer Door Lock Motor (with Door Closed) Oven Temperature Sensor Front Primary iring: P16-5 () to P16-7 () Secondary iring: P16-2 () to P16-3 () Front On Sister Board P2-1 (Y) to eutral () Front P23-4 (VT) to P23-6 (VT) Lower Oven Blower ear P24-5 () to eutral () Oven Shutdown Thermal Fuse Bake Element (2000 att) Broil Element (3000 att) Microwave Light Transformer (M/) ear Front Front P18-1 (O) to () ire at Double Line Break elay P18-4 () to () ire at Double Line Break elay P18-1 (O) to () ire at Double Line Break elay Door Unlocked = Open Circuit Door Locked = Closed Circuit Door Open = Open Circuit Door Closed = Closed Circuit Closed Circuit 75 Ω to 95 Ω Less than 1 Ω 2500 Ω F 14 Ω to 18 Ω Closed Circuit 26 Ω to 30 Ω 17 Ω to 20 Ω Top Primary inding 40 Ω to 45 Ω Secondary inding Upper Blower (M/) ear P24-6 (VT) to eutral () All Other Microwave Components ear Less than 1 Ω 10 Ω to 15 Ω COMPOET LOCATIOS COTOL SFOME * Short double line break relay red wire terminals fastons PIMAY SECODAY ED (P16-7) 120 VAC 60 Hz ED (P16-5) PIMAY SEC (P16-3) 20.3 VAC (P16-2) FO SEVICE TECHICIA'S USE OLY PAT O EV. A

8 PAGE 8 TECH SHEET - DO OT DISCAD Testing the Microwave Oven Components COMPOET TEST POCEDUE ESULTS HIGH VOLTAGE SFOME 2. emove the leads from the terminals. 3. Set the ohmmeter to x1 and touch the leads to the terminals. Primary Secondary Filament to Ground 4. Measure resistance (x100) Primary Filament ormal = Less than 1 Ω. ormal = Less than 1 Ω. ormal = 0 Ω. ormal = Infinity. ormal = Infinity. MAGETO 2. emove the leads from the terminals. 3. Set the ohmmeter to x1 and touch the leads to the F and FA terminals. 4. Set the ohmmeter to x1k and measure filament to chassis. ormal = approximately 0 Ω. ormal = Infinity. CAPACITO ECTIFIE 2. emove the leads from the terminals. 3. Set the ohmmeter to x1k and touch the leads to the terminals. 4. Terminal to chassis. 2. emove the leads from the terminals. 3. Set the ohmmeter to x1k and measure forward resistance. ormal = Momentarily indicates several ohms, and gradually returns to infinity. ormal = Infinity. ormal = Continuity. Abnormal = Infinity. FA MOTO 4. Measure the reverse resistance. OTE: Some inexpensive meters may show infinity in both directions. ormal = Infinity. Abnormal = Continuity. 2. emove the leads from the terminals. 3. Set the ohmmeter to x1 and touch the leads to the terminals. ormal = approximately 25 Ω. Abnormal = Infinity. TUTABLE MOTO 2. emove the leads from the terminals. 3. Set the ohmmeter to x1 and touch the leads to the terminals. ormal = approximately 25 Ω. Abnormal = Infinity. THEMAL FUSES 2. emove the leads from the terminals. 3. Set the ohmmeter to x1 and touch the leads to the terminals. Cavity Thermal Fuse Magnetron Thermal Fuse Cavity Thermal Fuse Open 329 F (165 C) Close ormal = Continuity. Abnormal = Infinity. Mag Thermal Fuse 293 F (145 C) 257 F (125 C) MAUFACTUED UDE OE O MOE OF THE FOLLOIG UITED STATES PATETS: 4,102,322 4,364,589 4,467,184 OTHE PATETS PEDIG PAT O EV. A FO SEVICE TECHICIA'S USE OLY 06/04